The phrase "twin islands" refers to two separate islands that are very similar in appearance, size, or features. They are like a pair of identical siblings in terms of their characteristics. Full definition
The expanded kitchen features twin islands with concrete countertops and bases wrapped in reclaimed wood. (hgtv.com)
The beautiful twin islands of Antigua & Barbuda are famous for their 365 beaches - one for each day of the year. (breakingtravelnews.com)
The dive site is made up of large granite boulders similar to those in Thailand's Similan Islands and offers the best of many diving opportunities around North Twin Island. (Dive-The-World.com)